Any reason why not ? -Just not certain because everybody, from my luthier to the manufacturer booklets, seem to agree I should only ever use alkaline batteries in my basses... I would assume that's only because alkaline last longer. But then again, I can't say I know much about batteries. If it's only for that reason, then a rechargeable would be just as good. What do you think ? And do you know good rechargeable brands ? The only one I know is RadioShack's. Not that they're bad, but as usual with that shop, I'm sure there exists better, and probably for cheaper too.